Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
  • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
  • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
  • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

Definitions

• a resistive touch screen is a sensor that converts the physical position of a touch point in a rectangular area into a voltage representing the X-axis coordinate and the Y-axis coordinate. Resistive touch screens can use four, five, seven, or eight lines to generate the screen bias voltage while reading back the voltage at the touch point.
• 1 is a schematic structural view of a resistive touch panel including a first resistive layer 11 and a second resistive layer 12.
• the two opposite edges of the first resistive layer 11 are provided with two first electrodes XI and a second electrode X2 which are parallel to each other, and two opposite edges of the second resistive layer 12 are provided with two parallel sides.
• the electrode Y1 and the fourth electrode Y2 are perpendicular to the first electrode XI and the second electrode X2, and the fourth electrode Y2 is perpendicular to the first electrode XI and the second electrode X2.
• a contact is formed between the 11 and the second resistive layer 12, and the equivalent circuit thereof is as shown in FIG.
• the resistance of the contact point to the first electrode XI is equivalent to the tenth resistance R10
• the resistance of the contact point to the second electrode X2 is equivalent to the twentieth resistance R20
• the resistance of the contact point to the third electrode Y1 is equivalent to
• the contact point to the fourth electrode Y2 is equivalent to the fortieth resistance R40
• the single-point contact resistance between the first resistive layer 11 and the second resistive layer 12 is equivalent to the contact resistance Rt.
• a resistive layer needs to be biased.
• the first electrode XI of the first resistive layer 11 is connected to the reference voltage, the second electrode X2 is grounded, and the third electrode Y1 or the fourth electrode Y2 of the second resistive layer 12 is directly connected to a modulus.
• ADC converter
• the resistive surface of the first resistive layer 11 is divided into the tenth resistor in the X-axis direction.
• R10 and twentieth resistor R20 Measured on the twentieth resistor R20 The voltage is proportional to the distance between the touch point and the second electrode X2, whereby the X-axis coordinate of the touch point can be calculated.
• PCT Patent Application Publication No. WO 2009/038277 A1 discloses a resistive touch screen that can recognize multi-touch.
• the touch screen includes a first resistance detecting pattern and a second resistance detecting pattern.
• the first resistance detecting pattern and the second resistance detecting pattern respectively include a plurality of parallel-arranged lines, and the parallel lines of the first resistance detecting pattern and the parallel lines of the second resistance detecting pattern are perpendicular to each other.
• the technical solution of the present invention provides a touch detection method, including: obtaining coordinates of an associated point of a touched point; obtaining a distance value between the touched points in a direction of the measured axis; a distance value between the coordinate and the touch point in the direction of the measured axis, determining a to-be-determined coordinate value of the touch point; determining an actual coordinate value of the touch point according to the to-be-determined coordinate value.
• the number of the touched points is two, and the coordinates of the associated point include the first An axis coordinate and a second axis coordinate; the first axis coordinate of the associated point is obtained according to at least one of the first coordinate and the second coordinate, and the first coordinate is offset from the first resistive layer of the touch screen by a second resistance
• the voltage of one electrode on the layer is related to the voltage of the other electrode on the second resistive layer when the first resistive layer of the touch screen is biased;
• the second axis of the associated point The coordinates are obtained according to at least one of a third coordinate and a fourth coordinate, the third coordinate being related to a voltage of an electrode on the first resistive layer when the second resistive layer of the touch screen is biased, the fourth The coordinates are related to the voltage of the other electrode on the first resistive layer when the second resistive layer of the touch screen is biased.
• the technical solution of the present invention further provides a touch detection device, comprising: an association point determining unit, adapted to obtain coordinates of an associated point of the touch point; and a distance determining unit adapted to obtain the direction between the touch points in the direction of the measured axis a distance coordinate; a to-be-determined coordinate determining unit, configured to determine a to-be-determined coordinate value of the touch point based on a coordinate of the coordinate of the associated point and a distance value between the touched points in a measured axis direction; And determining an actual coordinate value of the touch point according to the to-be-determined coordinate value.
• FIG. 1 is a schematic structural view of a resistive touch screen
• 2 is a schematic diagram of an equivalent circuit of a resistive touch screen in a single touch
• FIG. 1 is a schematic structural view of a resistive touch screen
• FIG. 3 is a flow chart of an embodiment of a touch detection method according to a technical solution of the present invention
• FIG. 5 is a schematic diagram of a circuit connection of a touch screen according to a technical solution of the present invention
• FIG. 6 is a schematic diagram of a resistor equivalent circuit of a touch screen in an X-axis direction when a two-point touch is applied according to the technical solution of the present invention
• FIG. 7 is a touch screen touch screen of the technical solution of the present invention
• FIG. 8 is a schematic diagram of another circuit connection of the touch screen according to the technical solution of the present invention
• FIG. 9 is a flow chart of another embodiment of the touch detection method according to the technical solution of the present invention
• FIG. 11 is a schematic structural diagram of an embodiment of a touch detection apparatus according to a technical solution of the present invention
• FIG. 12 is a schematic structural diagram of another embodiment of a touch detection apparatus according to a technical solution of the present invention.
• DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The invention is more specifically described in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become more apparent from the description.
• the touch detection method of the technical solution of the present invention includes:
• step S4 Determine an actual coordinate value of the touch point according to the to-be-determined coordinate value.
• the coordinates of the associated points of the touch points can be considered as the center coordinates of all touch points.
• the method of obtaining the coordinates of the associated point of the touch point can measure the multi-touch point as a single touch point. The following steps are further explained by taking two simultaneous touch points as an example.
• the coordinates of the associated point include a first axis coordinate and a second axis coordinate.
• the first axis coordinate of the associated point is obtained according to at least one of a first coordinate and a second coordinate, and the voltage of one electrode on the second resistive layer when the first coordinate is offset from the first resistive layer of the touch screen
• the second coordinate is related to a voltage of another electrode on the second resistive layer when the first resistive layer of the touch screen is biased
• the second axis coordinate of the associated point is according to the third coordinate and the fourth coordinate
• the voltage of the other electrode on the first resistive layer is related when the layer is biased. Specifically, as shown in FIG.
• the touch screen includes a first resistive layer and a second resistive layer. Two opposite edges of the first resistive layer are provided with two first electrodes XI and a second electrode X2 which are parallel to each other, and two opposite edges of the second resistive layer are provided with two third electrodes Y1 which are parallel to each other. And a fourth electrode Y2.
• the third electrode Y1 is perpendicular to the first electrode XI and the second electrode ⁇ 2, and the fourth electrode ⁇ 2 is also perpendicular to the first electrode XI and the second electrode ⁇ 2.
• Determining the resistive layer includes: applying a first voltage to one of the electrodes on the resistive layer, and applying a second voltage to another electrode on the resistive layer, the voltage value of the first voltage being greater than The voltage value of the second voltage.
• the first voltage is a high level greater than 0 volts and the second voltage is a ground voltage of 0 volts.
• the bias of the first resistive layer may be connected to the first electrode XI through the first driving pin XI_IN, and the second electrode X2 is grounded through the second driving pin X2_IN.
• the third electrode of the second resistive layer may be
• the Y1 is directly connected to the input end of the Analog-to-Digital Converter (ADC), and the driving pin is set to a high-impedance state, such as the third driving pin Y1 IN and the fourth electrode connected to the third electrode Y1.
• the fourth drive pin Y2_IN of the Y2 connection is set to a high resistance state.
• the first coordinate Xcl of the associated point can be calculated by the voltage value of the third electrode Y1 measured by the ADC being proportional to the distance from the associated point to the second electrode X2.
• the fourth electrode Y2 may be connected to the input end of the ADC, and the driving pin is set to a high resistance state, such as the third driving pin Yl_IN connected to the third electrode Y1 and the fourth electrode Y2.
• the fourth drive pin Y2_IN is set to a high resistance state.
• the second coordinate Xc2 of the associated point can be calculated by the voltage value of the fourth electrode Y2 measured by the ADC being proportional to the distance of the associated point to the second electrode X2.
• the first coordinate Xcl or the second coordinate Xc2 may each serve as the X-axis coordinate Xc of the associated point.
• the position of the finger on the touch screen is different, and the first coordinate Xcl and the second coordinate Xc2 may differ.
• the third electrode Y1 and the fourth electrode Y2 are respectively connected to the two input ends of the ADC, and the voltage values of the third electrode Y1 and the fourth electrode Y2 can be simultaneously measured, thereby calculating the first coordinate Xcl and the first point of the associated point.
• Two coordinates Xc2. Taking the arithmetic mean of the first coordinate Xcl and the second coordinate Xc2 as the X-axis coordinate Xc of the associated point, It is possible to reduce the error of d, the X-axis coordinate Xc of the associated point.
• the bias of the second resistive layer can be connected to the high level through the third driving pin Y1-IN, and the fourth driving pin Y2-IN
• the four electrodes Y2 are grounded.
• the first electrode of the first resistive layer may be
• the XI is directly connected to the input of the ADC.
• the driving pin is set to a high resistance state, such as the first driving pin XI_IN connected to the first electrode XI and the fourth driving pin X2-IN connected to the second electrode X2 being set to a high resistance state.
• the third coordinate Ycl of the associated point can be calculated by the voltage value of the first electrode XI measured by the ADC being proportional to the distance from the associated point to the fourth electrode Y2.
• the second electrode X2 may be connected to the input end of the ADC, and the driving pin is set to a high resistance state, such as the first driving pin XI_IN connected to the first electrode XI and the second electrode X2.
• the fourth drive pin X2_IN is set to a high impedance state.
• the fourth coordinate Yc2 of the associated point can be calculated by the voltage value of the second electrode X2 measured by the ADC being proportional to the distance from the associated point to the second electrode X2.
• the third coordinate Ycl or the fourth coordinate Yc2 may both be the Y-axis coordinate Yc of the associated point. The position of the finger on the touch screen is different, and the third coordinate Ycl and the fourth coordinate Yc2 may differ.
• the first electrode XI and the second electrode X2 are respectively connected to the two input ends of the ADC, and the voltage values of the first electrode XI and the second electrode X2 can be simultaneously measured, thereby calculating the third coordinate Ycl and the first point of the associated point.
• Four coordinates Yc2. Taking the arithmetic mean of the third coordinate Ycl and the fourth coordinate Yc2 as the Y-axis coordinate Yc of the associated point, the error of d, the Y-axis coordinate Yc of the associated point can be reduced.
• the coordinates (Xc, Yc) of the associated points can be regarded as the midpoint coordinates of the two touch points.
• step S2 obtaining distance values between the touch points in the direction of the measured axis includes: measuring voltages or currents on external resistors of the two resistive layers, respectively, or measuring electrodes on the two resistive layers respectively a current or voltage between them to obtain a resistance change value of the touch screen in a corresponding axis direction; determining the two in the corresponding axis direction based on a resistance change value of the touch screen in the first axis and the second axis direction The distance value of the touch point.
• the resistance change value of the touch screen in the corresponding axis direction includes: a resistance change value A Rx of the touch screen in the X-axis direction and a resistance change value ⁇ Ry of the touch screen in the Y-axis direction. Specifically, first measure a voltage or current on an external resistor connected to the electrode of the resistive layer to obtain a resistance value of the touch screen in a corresponding axis direction when touched; then, the touch screen is in a corresponding axis direction when touched The difference between the resistance value and the resistance value of the touch screen in the corresponding axis direction when there is no touch is used as the resistance change value of the touch screen in the corresponding axis direction. As shown in FIG.
• FIG. 6 is a schematic diagram of a resistor equivalent circuit of the touch screen in the X-axis direction according to the technical solution of the present invention.
• the resistance of one touch point to the first electrode XI on the first resistive layer is equivalent to the eleventh resistor R11, and the resistance value of the eleventh resistor R11 is rl l.
• the resistance between the two touch points on the first resistive layer is equivalent to the sixth resistor R6, and the resistance value of the sixth resistor R6 is r6.
• the resistance between the two touch points on the second resistive layer is equivalent to the fifth resistor R5, and the resistance value of the fifth resistor R5 is r5.
• the single point contact resistance between the first resistive layer and the second resistive layer is equivalent to the contact resistance Rt, and the contact resistance Rt has a resistance value of rt.
• the resistance of the other touch point on the first resistive layer to the second electrode X2 is equivalent to the twelfth resistor R12, and the resistance value of the twelfth resistor R12 is rl2.
• the eleventh resistor R1 l , the sixth resistor R6 , the twelfth resistor R12 and the first external resistor Rsx are connected in series, the two contact resistors Rt and the fifth resistor R5 are connected in series, and the two contact resistors Rt after the series connection And the fifth resistor R5 is connected in parallel to the sixth resistor Both ends of the R6.
• the first electrode XI can be connected to the high level through the first driving pin XI_IN, and the second end XR2 of the first external resistor Rsx can be grounded.
• the first end of the first external resistor Rsx is also connected to the input end of the ADC, and the ADC can detect the voltage on the first external resistor Rsx.
• the resistance value of the touch screen in the X-axis direction upon touch can be determined based on the voltage value on the first external resistor Rsx.
• the difference between the resistance value of the touch screen in the X-axis direction when touched and the resistance value of the touch screen in the X-axis direction when there is no touch is used as the resistance change value ⁇ Rx of the touch screen in the X-axis direction.
• the third electrode Y1 can be connected to the high level through the third driving pin Y1 - IN, and the second end YR2 of the second external resistor Rsy is grounded.
• the first end of the second external resistor Rsy is further connected to the input end of the ADC, and the ADC can detect the voltage on the second external resistor Rsy.
• the resistance value of the touch screen in the Y-axis direction upon touch can be determined based on the voltage value on the second external resistor Rsy.
• the difference between the resistance value of the touch screen in the Y-axis direction when touched and the resistance value of the touch screen in the Y-axis direction when there is no touch is used as the resistance change value ⁇ Ry of the touch screen in the Y-axis direction.
• the resistance change value ⁇ Rx of the touch screen in the X-axis direction and the resistance change A Ry in the Y-axis direction the distance values of the two touch points in the X-axis direction and the Y-axis direction can be determined.
• the first resistive layer resistivity of the touch screen is Kx (the resistance value of the first resistive layer divided by the width of the touch screen, a known value).
• the second resistive layer resistivity of the touch screen is Ky (the resistance of the second resistive layer divided by the height of the touch screen, a known value).
• the equivalent resistance value of the touch screen in the X-axis direction when no touch is rx0.
• the distance value ⁇ of the two touch points in the X-axis direction can be obtained from the resistance change value ARx of the touch screen in the X-axis direction.
• the following equation (7) can be obtained based on the resistance equivalent circuit of the touch screen in the x-axis direction,
• the distance value Ay of the two touch points in the Y-axis direction can be obtained from the resistance change value ARy of the touch screen in the Y-axis direction, which will not be described herein.
• the above formulas (6) and (7) can also be binarized, for example, using a one-order equation or multiple equations to approximate, or constructing an empirical formula using measured data to reduce the amount of calculation such as square root. Big part.
• step S3 two touches can be determined according to the coordinates (Xc, Yc) of the associated point, the distance value ⁇ X of the two touch points in the X-axis direction, and the distance value ⁇ y of the two touch points in the Y-axis direction.
• the following undetermined coordinate values of the point The first set of pending coordinate values: ( Xc- ⁇ x/2, Yc- ⁇ y/2), ( Xc + ⁇ x / 2, Yc + ⁇ y / 2)
• the second set of to-be-determined coordinate values ( Xc- ⁇ x/2, Yc+ ⁇ y/2) , ( ⁇ + ⁇ /2, Yc- ⁇ y/2)
• the third set of undetermined coordinate values ( Xc, Yc- ⁇ y /2), ( Xc, Yc+ ⁇ y/2)
• the fourth set of undetermined coordinate values ( Xc- ⁇ x/2, Yc), ( Xc + ⁇ x/2, Yc)
• a group is the actual coordinate value of two touch points.
• step S4 according to the distance value ⁇ of the two touch points in the X-axis direction is zero, the actual coordinate values of the two touch points can be directly determined as the third set of undetermined coordinate values: (Xc, Yc-Ay/2) , ( Xc, Yc+Ay/2) Struktur According to the distance value ⁇ y of the two touch points in the Y-axis direction is zero, the actual coordinate values of the two touch points can be directly determined as the fourth set of undetermined coordinate values: ( ⁇ - ⁇ /2, Yc), ( ⁇ .+ ⁇ /2, Yc).
• the two touch points determined by the selected set of to-be-determined coordinate values are: electrodes with a larger voltage near the one resistive layer and electrodes with a higher voltage when biased near the other resistive layer a touch point, and a touch point of the electrode adjacent to the lower voltage of the electrode adjacent to the one resistive layer and adjacent to the other resistive layer. Specifically, as shown in FIG.
• the first touch The coordinates of the point A1 are (Xc-Ax/2, Yc-Ay/2), the coordinates of the second touch point B1 are (Xc+Ax/ 2 , Yc+Ay/ 2 ), and the coordinates of the third touch point A2 are ( Xc-Ax/2, Y c+Ay/2), the coordinates of the fourth touch point are (Xc+Ax/2, Yc-Ay/2), and the coordinates of the associated point C are (Xc, Yc).
• the first A touch point A1 and a third touch point A2 are close to the first electrode XI connected to the high level, and the second touch point B1 and the fourth touch point B2 are close to the grounded second electrode X2, so the voltage of the first touch point A1 is higher than The voltage of the second touch point B1, the voltage of the third touch point A2 is higher than the voltage of the fourth touch point B2.
• the third electrode Y1 is closer to the first touch point A1 and the fourth touch point B2, so the third electrode of the ADC measurement The voltage value of Y1 is closer to the voltages of the first touch point A1 and the fourth touch point B2.
• the fourth electrode Y2 is closer to the second touch point B1 and the third touch point A2, so The voltage value of the fourth electrode Y2 measured by the ADC is closer to the voltages of the second touch point B1 and the third touch point ⁇ 2. If the voltage value of the third electrode Y1 measured by the ADC is greater than the voltage value of the fourth electrode ⁇ 2 measured by the ADC, the two touch points are the first touch point A1 and the second touch point B1, that is, the actual coordinate values of the two touch points. The first set of pending coordinate values.
• the two touch points are the third touch point ⁇ 2 and the fourth touch point ⁇ 2, that is, the actual coordinate values of the two touch points.
• the second set of pending coordinate values If the voltage value of the third electrode Y1 measured by the ADC is less than the voltage value of the fourth electrode ⁇ 2 measured by the ADC, the two touch points are the third touch point ⁇ 2 and the fourth touch point ⁇ 2, that is, the actual coordinate values of the two touch points.
• the second set of pending coordinate values are the third touch point ⁇ 2 and the fourth touch point ⁇ 2, that is, the actual coordinate values of the two touch points.
• the two touch points are a touch point A1 and a second touch point B1, that is, the actual coordinate values of the two touch points are the first set of undetermined coordinate values; if the voltage value of the first electrode XI measured by the ADC is smaller than the voltage value of the second electrode ⁇ 2 measured by the ADC Then, the two touch points are the third touch point ⁇ 2 and the fourth touch point ⁇ 2, that is, the actual coordinate values of the two touch points are the second set of pending coordinates.
• the actual coordinate values of the two touch points can be selected by biasing the first resistive layer or biasing the second resistive layer.
• the voltage value of the third electrode Y1 measured by the ADC is greater than the voltage value of the fourth electrode ⁇ 2 measured by the ADC such that the first coordinate Xcl obtained in step S1 is smaller than the second coordinate Xc2, and the voltage value of the third electrode Y1 measured by the ADC is smaller than that measured by the ADC.
• the voltage value of the fourth electrode Y2 is such that the first coordinate Xcl of the associated point is greater than the second coordinate Xc2.
• the actual coordinate values of the two touch points are the first set of undetermined coordinate values, and the actual coordinate value of the two touch points when the first coordinate Xcl is greater than the second coordinate Xc2 is the second group.
• the actual coordinate values of the two touch points can also be selected among the two sets of undetermined coordinate values.
• the third coordinate Ycl When the fourth coordinate Yc2 is smaller than the fourth coordinate Yc2, the actual coordinate values of the two touch points are the first set of undetermined coordinate values, and when the third coordinate Ycl is greater than the fourth coordinate Yc2, the actual coordinate values of the two touch points are the second set of pending coordinate values.
• the calculation of the first coordinate Xcl, the second coordinate Xc2, the third coordinate Ycl, and the fourth coordinate Yc2 may employ a hardware acceleration module, so comparing these coordinates may reduce the software workload.
• the voltage of the third electrode Y1 and the fourth electrode Y2 measured by the ADC may be selected by using the bias of the first resistive layer.
• the actual coordinate value of the touch point which increases the reliability of obtaining the actual coordinate value.
• the difference between the voltage values of the third electrode Y1 and the fourth electrode Y2 measured by the ADC is smaller than the difference between the voltage value of the first electrode XI measured by the ADC and the voltage value of the second electrode X2, that is, the first coordinate Xcl and the second
• the difference of the coordinate Xc2 is smaller than the difference between the third coordinate Ycl and the fourth coordinate Yc2
• the voltage value of the first electrode XI and the voltage value of the second electrode X2 measured by the ADC may be offset by the second resistive layer. To select the actual coordinate values of the two touch points, this can increase the reliability of obtaining the actual coordinate values.
• the coordinates may be screen coordinates, for example, taking a point on the touch screen plane as an origin, and establishing a coordinate system, such as a Cartesian coordinate system or a polar coordinate system, on the touch screen plane.
• the coordinates may also be actual distances, the units of which may be actual distance units, such as millimeters.
• the coordinates can also be expressed in pixels.
• the distance represented by the unit of length also has various expression methods, such as the actual distance unit is millimeter, or the pixel distance.
• the distance between the coordinates of the touch points For polar coordinates, one of them is the angular difference between the two points.
• the coordinates (1, 1) indicate the coordinates of the touch point after moving 1 mm from the origin to the right and then 1 mm down.
• the coordinates (1, 1) indicate the pixel coordinates shifted by 1 pixel from the origin to the right and 1 pixel down.
• the touch detection method when the touch point includes two touch points is exemplified below. Assume that the actual two touch point coordinates are (10, 45), (40, 15).
• the resistance of the first resistive layer is 251.2 ohms.
• the resistance of the second resistive layer is 421.1 ohms.
• the first external resistor Rsx has a resistance of 100 ohms.
• the second external resistor Rsy has a resistance of 100 ohms.
• the third external resistor has a resistance of 50 ohms.
• the distance between the first electrode XI and the second electrode X2 is 45 mm.
• the distance between the third electrode Y1 and the fourth electrode Y2 is 63 mm.
• the contact resistance Rt has a resistance of 304 ohms (the contact resistance Rt resistance value varies according to the touch weight, but the error has little effect on the result, so the contact resistance Rt resistance value is regarded as a constant).
• the first electrode XI is added with a high level of 3 volts through the first driving pin XI_IN, and is grounded through the second driving pin X2 - IN the second electrode X2, and will be third.
• the electrode Y1 and the fourth electrode Y2 are respectively connected to different inputs of the same ADC.
• the driving pin is set to a high resistance state, such as a third driving pin Y1 IN connected to the third electrode Y1 and a fourth driving pin Y2_IN connected to the fourth electrode Y2, and a first external resistor Rsx
• the driving pin connected to the second terminal YR2 of the second terminal XR2 and the second external resistor Rsy is set to a high resistance state.
• the ADC measures the voltage value of the third electrode Y1 to 1.27 volts, and the ADC measures the voltage value of the fourth electrode Y2 to be 1.40 volts. Therefore, the first coordinate Xcl of the associated point is 25.95 mm, and the second coordinate Xc2 of the associated point. For 24.0 mm, the arithmetic mean of the first coordinate Xcl and the second coordinate Xc2 is 24.98 mm.
• the third electrode Y1 is added with a high level of 3 volts through the third driving pin Y1-IN, the fourth electrode Y2 is grounded through the fourth driving pin Y2_IN, and the first electrode XI and the second electrode X2 are respectively connected Different inputs of the same ADC.
• Drive pin set to high impedance a first driving pin XI_IN connected to the first electrode XI and a second driving pin X2_IN connected to the second electrode X2, and a second terminal XR2 and a second connecting with the first external resistor Rsx
• the driving pin connected to the second terminal YR2 of the external resistor R S y is set to a high resistance state.
• the ADC measures the voltage value of the first electrode XI to be 1.47 volts, and the ADC measures the voltage value of the second electrode X2 to be 1.67 volts. Therefore, the third coordinate Ycl of the associated point is 29.93 mm, and the fourth coordinate Yc2 of the associated point. For 32.13 mm, the arithmetic mean of the third coordinate Ycl and the fourth coordinate Yc2 is 30.03 mm.
• the arithmetic mean of the first coordinate Xcl and the second coordinate Xc2 is taken as the X-axis coordinate of the associated point
• the arithmetic mean of the third coordinate Ycl and the fourth coordinate Yc2 is taken as the Y-axis coordinate of the associated point, that is, the coordinate of the associated point is (24.98 mm, 30.03 mm).
• the coordinates of the associated point 24.98 mm, 30.03 mm
• the coordinates of the associated point are regarded as the midpoint coordinates of the two touch points.
• the first electrode XI is applied with a high level of 3 volts through the first driving pin XI_IN, and the second terminal XR2 of the first external resistor Rsx is grounded.
• the voltage on the first external resistor Rsx is 0.8542 volts, and the resistance of the touch screen is 251.2 ohms.
• the distance value ⁇ of the two touch points in the X-axis direction was obtained to be 29.5 mm.
• the distance value Ay of the two touch points in the Y-axis direction is obtained to be 32.2 mm.
• step S3 due to the distance value ⁇ of the two touch points in the X-axis direction And the distance value Ay of the two touch points in the Y-axis direction is not zero, so the coordinates of the associated point (24.98 mm, 30.03 mm) and the distance between the two touch points in the X-axis direction
• the value ⁇ is 29.5 mm
• the distance value Ay of the two touch points in the Y-axis direction is 32.2 mm
• two sets of undetermined coordinate values corresponding to the two touch points can be obtained:
• the second set of to-be-determined coordinate values ( 10.23mm, 46.13mm ), (
• the touch detection method may further include: Step S5: Comparing actual coordinate values of the two sets of the touch points to generate an indication signal.
• the comparing the actual coordinate values of the two sets of the touch points, generating the indication signal includes: comparing actual coordinate values of the two sets of the touch points to determine a touch change, generating a corresponding indication signal, where the touch change comprises touching The angle of the point changes or the distance changes.
• the indication signal indicates at least one of a shortcut menu that performs zooming in, zooming out, rotating, page turning, advancing, rewinding, speeding up, slowing down, and popping the current state.
• FIG. 10 shows four touch points: a first touch point 101, a second touch point 102, a third touch point 201, and a fourth touch point 202.
• the first touch point 101 and the second touch point 102 are the first group of two touch points simultaneously applied on the touch screen, and the third touch point 201 and the fourth touch point 202 are the second group of two simultaneously applied on the touch screen. Touch The point, and the first touch point 101, the second touch point 102, the third touch point 201, and the fourth touch point 202 have a temporal sequence, which are not simultaneously applied to the touch screen.
• the actual coordinates of the first touch point 101 and the second touch point 102 are obtained by steps S1 to S4 of the technical solution of the present invention (11. 2 mm, 21.4 mm), ( 34.1mm, 51.6mm).
• the actual coordinates of the third touch point 201 and the fourth touch point 202 are obtained by steps S1 to S4 of the technical solution of the present invention ( 15.7 mm, 31.1 mm ), ( 23.7mm, 42.1mm).
• the distance between the first touch point 101 and the second touch point 102 is 37.9 mm, which is 52.8 degrees from the X axis.
• the distance between the third touch point 201 and the fourth touch point 202 is 13.6 mm, which is 53.9 degrees from the X axis.
• the zoom-in indication signal is generated based on the fact that the angle between the two sets of touch points does not substantially change and the distance is reduced. As shown in FIG.
• the technical solution of the present invention further provides a touch device, including: an association point determining unit 1 adapted to obtain coordinates of an associated point of a touch point; and a distance determining unit 2 adapted to Obtaining a distance value between the touch points in the direction of the measured axis; the to-be-determined coordinate determining unit 3 is adapted to determine the distance between the coordinates of the associated point and the touched point in the direction of the measured axis The to-be-determined coordinate value of the touch point; the actual coordinate determining unit 4 is adapted to determine an actual coordinate value of the touch point according to the to-be-determined coordinate value.
• the coordinates of the associated point include a first axis coordinate and a second axis coordinate; the first axis coordinate of the associated point is according to at least one of the first coordinate and the second coordinate Obtaining that the first coordinate is related to a voltage of one electrode on the second resistive layer when the first resistive layer of the touch screen is biased, and the second coordinate is opposite to the first resistive layer of the touch screen.
• the voltage of the other electrode on the layer is related; the second axis of the associated point The coordinates are obtained according to at least one of a third coordinate and a fourth coordinate, the third coordinate being related to a voltage of an electrode on the first resistive layer when the second resistive layer of the touch screen is biased, the fourth The coordinates are related to the voltage of the other electrode on the first resistive layer when the second resistive layer of the touch screen is biased.
• the association point determining unit 1 may include: a biasing unit.
• the biasing unit is adapted to apply a first voltage to one electrode on the resistive layer and a second voltage to the other electrode on the resistive layer, the voltage value of the first voltage being greater than the first The voltage value of the two voltages.
• the first voltage is a high level greater than 0 volts and the second voltage is a ground voltage of 0 volts.
• the distance determining unit 2 is adapted to measure the voltage or current on the external resistors of the two resistive layers, respectively, or measure the current between the electrodes on the two resistive layers or a voltage to obtain a resistance change value of the touch screen in a corresponding axis direction, and determining a distance value of the two touch points in a corresponding axis direction based on a resistance change value of the touch screen in the first axis and the second axis direction .
• the resistance change value of the touch screen in the corresponding axis direction is the difference between the resistance value of the touch screen in the corresponding axis direction when the touch screen is touched and the resistance value of the touch screen in the corresponding axis direction when there is no touch;
• the resistance value of the touch screen in the corresponding axis direction is obtained by measuring the voltage or current on the external resistor of the corresponding resistive layer, or by the current or voltage between the electrodes on the corresponding resistive layer.
• the distance determining unit 2 may include: a first distance determining subunit and a second distance determining subunit. The first distance determining subunit is adapted to be based on
• a distance value A y of the two touch points in the second axis direction is calculated, wherein A Ry is a resistance change value of the touch screen in the second axis direction.
• the above formula can also be binarized, for example, using a one-order equation or multiple equations to approximate, or constructing an empirical formula using measured data to reduce a large amount of calculation such as square root.
• the to-be-determined coordinate value of the touched point includes two sets of to-be-determined coordinate values, and each set of to-be-determined coordinate values includes two to-be-determined coordinate values;
• the actual coordinate determining unit is adapted to Selecting a set of undetermined coordinate values as actual coordinate values of the two touch points according to a magnitude relationship of voltages of two electrodes on the first resistive layer or the second resistive layer, and two electrodes on the first resistive layer The voltage of the two electrodes on the first resistive layer when the second resistive layer of the touch screen is biased, and the voltage of the two electrodes on the second resistive layer is the first resistivity of the touch screen The voltage of the two electrodes on the second resistive layer when the layer is biased.
• the actual coordinate determining unit 4 may include: a first actual coordinate determining subunit.
• the first actual coordinate determining subunit is adapted to be first when the voltage difference between the two electrodes on the first resistive layer is greater than the voltage difference between the two electrodes on the second resistive layer The voltage magnitude relationship of the two electrodes on the resistive layer selects a set of undetermined coordinate values as the actual coordinate values of the two touch points.
• the actual coordinate determining unit 4 may further include: a second actual coordinate determining subunit.
• the second actual coordinate determining subunit is adapted to be when the voltage difference between the two electrodes on the second resistive layer is greater than the voltage difference between the two electrodes on the first resistive layer, according to the second
• the voltage magnitude relationship of the two electrodes on the resistive layer selects a set of undetermined coordinate values as the actual coordinate values of the two touch points.
• the two touch points determined by the selected set of to-be-determined coordinate values are: an electrode having a relatively high voltage near the one resistive layer and an electrode connected to a high level when biased near the other resistive layer Touching the point, and the touch point of the electrode that is grounded near the voltage of the one resistive layer and close to the other resistive layer. As shown in FIG.
• the touch device of the technical solution of the present invention further includes: an indication signal generating unit 5, configured to compare actual coordinate values of the touch points determined by the two sets of actual coordinate determining units 4, Generate an indication signal.
• the indication signal generating unit includes: a comparison subunit adapted to compare actual coordinate values of the two sets of the touch points to determine a touch change, the touch change including an angle change or a distance change of the touch point; generating a subunit, suitable for A corresponding indication signal is generated based on the touch change.
• the indication signal includes at least one of a shortcut menu indicating that zooming in, zooming out, rotating, turning, advancing, rewinding, accelerating, slowing, and popping the current state is performed.
• each unit or subunit of the touch device of the foregoing embodiment may be implemented by a program to instruct related hardware, or may be implemented based on an embedded system of software and hardware, and the program may be stored in
• the storage medium may be a ROM, a RAM, a Flash, a memory card, a magnetic disk, an optical disk, or the like.

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• 2013
  • 2013-06-05 CN CN201380000605.4A patent/CN104395870B/zh active Active
  • 2013-06-05 US US14/239,921 patent/US9785300B2/en active Active
  • 2013-06-05 WO PCT/CN2013/076800 patent/WO2014194497A1/zh active Application Filing
  • 2013-11-25 EP EP13194227.8A patent/EP2811381A1/de not_active Ceased
  • 2013-12-10 IN IN2317MUN2013 patent/IN2013MN02317A/en unknown

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